I have an 86 Rickenbacker 4003 with a fairly new pair of Fender flats on it. I know you're supposed to get the neck almost completely straight (referring to Joey's guide) which it is. If I hold down the first and last fret at the E or G string i can fit a piece of paper or two through it. However, I'm still getting a buzz that comes through the amp on the A string most strongly through the 10th-12th frets. I tried raising the bridge almost to the point of it being pretty uncomfortable to play and the buzz is still there. The bass is in very good condition with little wear on the fretboard. It was basically unplayed when I got it five years ago, and I haven't heavily used it either and have always used half rounds.